class data_pars:
	def __init__(self,title,link,description=""):
		self.__title = title
		assert link.startswith('http://')
		self.__link = link
		self.__description = description
	@property
	def title(self):
		return self.__title
	@property
	def link(self):
		return self.__link
	@property
	def description(self):
		return self.__description
	def __repr__(self):
		return "Data_Pars('{0}' '{1}')".format(self.__title,self.__link)